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Old 2011-02-17, 19:46   #1
nuggetprime
 
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Mar 2007
Austria

4568 Posts
Default Gimme Atom timings!

Yes,I know Atoms suck somewhat for number crunching stuff,but I'm still interested in timings as I'm planning to extend my crunchforce by something low-power which will run 24/7.
I'm not that interested in 10MDigit mersenne stuff,but instead somewhat smaller candidates using LLR.
So if you have a netbook/nettop/something else with an Intel Atom CPU(any model,please tell me which one it's got) and can waste a bit of CPU time: get LLR 3.8.5 for your operating system from jpenne.free.fr,unzip it and run:
Linux:
Code:
./llr -d -q325*2^100001-1
Windows
[open command prompt and go to directory where LLR binary is]
Code:
llr -d -q325*2^100001-1
and post the output here.

Thanks
Nugget
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Old 2011-02-18, 03:09   #2
Harvey563
 
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Apr 2004

18310 Posts
Default N270 @ 1.6 Ghz

steven@steven-eee:~/Desktop$ ./llr -d -q325*2^100001-1
Starting Lucas Lehmer Riesel prime test of 325*2^100001-1
Using FFT length 6K
325*2^100001-1 is not prime. LLR Res64: 1784445AA7974710 Time : 111.009 sec.
steven@steven-eee:~/Desktop$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU N270 @ 1.60GHz
stepping : 2
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe lahf_lm
bogomips : 3192.32
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 32 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU N270 @ 1.60GHz
stepping : 2
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe lahf_lm
bogomips : 3191.95
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 32 bits virtual
power management:

steven@steven-eee:~/Desktop$
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Old 2011-02-18, 12:06   #3
nuggetprime
 
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Mar 2007
Austria

2·151 Posts
Default

That's about 8 times slower than on my P4,so Atom can't really impress for primality testing.
Does anybody know some other low-power system (<20 W) that has better performance for this kind of work?
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Old 2011-02-18, 18:36   #4
fivemack
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Feb 2006
Cambridge, England

6,323 Posts
Default

Quote:
Originally Posted by nuggetprime View Post
Yes,I know Atoms suck somewhat for number crunching stuff,but I'm still interested in timings as I'm planning to extend my crunchforce by something low-power which will run 24/7.
Basically, the fact that computers have lots of things in them other than the CPU means that optimum performance-per-watt for pure-CPU jobs comes from the lowest-end version of fast computers ... an underclocked i5/2500 with just enough memory and the OS on a USB stick is probably as good performance-per-watt as you can get.
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Old 2011-02-18, 22:07   #5
imwithid
 
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Apr 2009
Venice, Chased by Jaws

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Default

I was hoping someone would post such info. Now I'm curious to see that compared to more recent versions (e.g. D510). AFAIK, the N270 is the bottom of the line for the Atom series. My understanding is that it would be comparable to a Centrino of similar rating (in this case, 1.6 Ghz for the D510).
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Old 2011-02-21, 08:28   #6
ldesnogu
 
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Jan 2008
France

10318 Posts
Default

All currently available Atom cores share the same micro-architecture. So I'd expect single thread performance to be very similar on all of them (of course, availability of 64-bit could make a difference, but anyway Atom is a low performer across all the range).
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